00:26:12.961  ========== Backtrace start: ==========
00:26:12.961  
00:26:12.961  in /var/jenkins/workspace/nvmf-phy-autotest/spdk/test/nvmf/host/perf.sh:72 -> main(["--transport=rdma"])
00:26:12.961       ...
00:26:12.961     67  	$rpc_py nvmf_delete_subsystem nqn.2016-06.io.spdk:cnode1
00:26:12.961     68  	
00:26:12.961     69  	if [ $RUN_NIGHTLY -eq 1 ]; then
00:26:12.961     70  		# Configure nvme devices with nvmf lvol_bdev backend
00:26:12.961     71  		if [ -n "$local_nvme_trid" ]; then
00:26:12.961  => 72  			ls_guid=$($rpc_py bdev_lvol_create_lvstore Nvme0n1 lvs_0)
00:26:12.961     73  			get_lvs_free_mb $ls_guid
00:26:12.961     74  			# We don't need to create an lvol larger than 20G for this test.
00:26:12.961     75  			# decreasing the size of the nested lvol allows us to take less time setting up
00:26:12.961     76  			#before running I/O.
00:26:12.961     77  			if [ $free_mb -gt 20480 ]; then
00:26:12.961       ...
00:26:12.961  
00:26:12.961  ========== Backtrace end ==========